Elastoplastic and creep analysis with the ASKA program system

The objective of this article is a concise presentation of the extension of the general purpose program ASKA (Automatic System for Kinematic Analysis) to include material non-linearities such as plasticity and creep. A short derivation of the incremental stress-strain relations which form the basis of the iterative numerical procedure is given first, followed by a more detailed description of the relevant software package. An elastoplastic calculation of a pressure vessel as a typical application and suggestions for further developments conclude the article.